完整后端代码：基于Spring boot + Mybatis-Plus+Thymeleaf+Bootstrap 开发的 JavaWeb 留言板
本项目采用Bootstrap框架进行开发的，在上方可以输入留言。留言信息在下方以层次结构的形式进行展示。图标使用的是font-awesome。
效果图如下。
comments下的comment为每个留言的信息。而comment中的comments则是回复改留言的内容
代码
bootstrap和font-awesome需自行下载导入
note.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link href="./static/css/bootstrap.css" rel="stylesheet">
<link href="./static/css/mycss.css" rel="stylesheet">
<script src="./static/js/jquery-3.4.1.min.js"></script>
<script src="./static/js/bootstrap.bundle.min.js"></script>
<style>
</style>
</head>
<body background="static/img/bg.png">
<!--导航栏-->
<div class="container-lg-fluid shadow bg-dark mb-4">
<div class="container ">
<nav class="navbar navbar-expand-lg ">
<a class="navbar-brand font-weight-normal font-italic" href="index.html" style="font-size: 1.5em">留言板</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarBlog"
aria-controls="navbarOJ" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarBlog">
<ul class="navbar-nav mr-auto ">
<li class="nav-item text-dark">
<a class="nav-link font-weight-normal " href="index.html"><i
class="fa fa-home mini mr-1"></i>首页 <span
class="sr-only">(current)</span></a>
</li>
<li class="nav-item text-dark">
<a class="nav-link font-weight-normal" href="note.html"><i
class="fa fa-envelope mini mr-1"></i>留言</a>
</li>
</ul>
<a type="button nav-item " class="nav-item btn float-right font-weight-normal hover text-primary ml-3">登录</a>
</div>
</nav>
</div>
</div>
<div class="container-lg mt-5">
<div class="card border p-2">
<div class="card-header text-info border-bottom border-info" style="background-color: white;">
留言
</div>
<div class="card-body">
<!-- 输入框-->
<div id="noteEdit">
<textarea name="note"></textarea>
</div>
<!--提交列表-->
<div class="input list-inline mt-3 container-fluid ">
<div class="row ">
<div class="border rounded list-inline-item col-lg-auto pr-0">
<i class="fa fa-user mr-1" style="color: #ccc"></i>
<input type="text" placeholder="姓名" class="pl-2 m-0 h-100 border-0 pr-0">
</div>
<div class="border rounded list-inline-item col-lg-auto pr-0">
<i class="fa fa-envelope mr-1" style="color: #ccc"></i>
<input type="text" placeholder="邮箱" class="pl-2 h-100 border-0">
</div>
<div class=" list-inline-item align-self-center col-lg-auto p-0 ">
<div class="container-fluid mt-2 ">
<label class="switch">
<input type="checkbox">
<div class="slider round"></div>
</label>
</div>
</div>
<div class=" list-inline-item col-lg-auto p-0">
<button type="button" class="btn btn-info " style="width: 100%;height: 100%">发送</button>
</div>
</div>
</div>
<!--留言列表-->
<div class=" container-fluid mt-5 border p-2" style="border-top: #17a2b8 solid 2px !important;">
<div class="p-1 comments">
<div class="container comment m-1 p-0">
<a class="me-a avatar p-0 m-0">
<img class="w-100 h-100 rounded-circle" src="https://s1.ax1x.com/2020/04/10/GTQcH1.png"
alt="">
</a>
<div class=" ml-3 border-left ">
<div class="container ml-2">
<a class="author">
<span>王也</span>
<span class="border-primary border rounded text-primary small p-1">亿贫如洗</span>
<span class="summary-text small">2020-04-10 16:01:27</span>
</a>
</div>
<div class="messageText ml-2 container m-2">诸葛青，你败过吗？</div>
<!-- 评论回复-->
<div class="p-1 comments m-3">
<div class="container comment m-1 p-0">
<a class="me-a avatar p-0 m-0 ">
<img class="w-100 h-100 rounded-circle"
src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1586518306370&di=600bf4377f924f0839d54e1c415228da&imgtype=0&src=http%3A%2F%2Fb-ssl.duitang.com%2Fuploads%2Fitem%2F201712%2F17%2F20171217170206_MAmwi.png"
alt="">
</a>
<div class=" ml-3 ">
<div class="container ml-2">
<a class="author ">
<span>冯宝宝</span>
<span class="border-primary border rounded text-primary small p-1">机智一批</span>
<span class="text-info">@王也 </span>
<span class="summary-text small">2020-04-10 16:01:27</span>
</a>
</div>
<div class="messageText ml-2 container m-2">王也，你被埋过吗？</div>
</div>
</div>
</div>
</div>
</div>
<div class="container comment m-1 p-0">
<a class="me-a avatar p-0 m-0">
<img class="w-100 h-100 rounded-circle" src="http://img.jk51.com/img_jk51/146022467.jpeg"
alt="">
</a>
<div class=" ml-3 border-left ">
<div class="container ml-2">
<a class="author">
<span>冯宝宝</span>
<span class="border-primary border rounded text-primary small p-1">机智一批</span>
<span class="summary-text small">2020-04-10 16:01:27</span>
</a>
</div>
<div class="messageText ml-2 container m-2">他们总说我瓜，其实我一点也不瓜，大多时候我都机智的一批</div>
<!-- 评论回复-->
<div class="p-1 comments m-3">
<div class="container comment m-1 p-0">
<a class="me-a avatar p-0 m-0 ">
<img class="w-100 h-100 rounded-circle"
src="https://ss0.bdstatic.com/70cFvHSh_Q1YnxGkpoWK1HF6hhy/it/u=3020624611,2570469813&fm=26&gp=0.jpg"
alt="">
</a>
<div class=" ml-3 ">
<div class="container ml-2">
<a class="author ">
<span>张楚岚</span>
<span class="border-primary border rounded text-primary small p-1">月下观鸟</span>
<span class="text-info">@冯宝宝 </span>
<span class="summary-text small">2020-04-10 16:01:27</span>
</a>
</div>
<div class="messageText ml-2 container m-2">
我机智你奶奶个腿儿啊，要不是打不过你，我非敲烂你这颗机智的头，你哪偷的铁锹，你到底多爱埋人！
</div>
</div>
</div>
<div class="container comment m-1 p-0">
<a class="me-a avatar p-0 m-0 ">
<img class="w-100 h-100 rounded-circle"
src="https://s1.ax1x.com/2020/04/10/GTQcH1.png" alt="">
</a>
<div class=" ml-3 ">
<div class="container ml-2">
<a class="author ">
<span>王也</span>
<span class="border-primary border rounded text-primary small p-1">亿贫如洗</span>
<span class="text-info">@冯宝宝 </span>
<span class="summary-text small">2020-04-10 16:01:27</span>
</a>
</div>
<div class="messageText ml-2 container m-2">你这也太溜了！</div>
</div>
</div>
<div class="container comment m-1 p-0">
<a class="me-a avatar p-0 m-0 ">
<img class="w-100 h-100 rounded-circle"
src="https://ss0.bdstatic.com/70cFvHSh_Q1YnxGkpoWK1HF6hhy/it/u=3020624611,2570469813&fm=26&gp=0.jpg"
alt="">
</a>
<div class=" ml-3 ">
<div class="container ml-2">
<a class="author ">
<span>冯宝宝</span>
<span class="border-primary border rounded text-primary small p-1">机智一批</span>
<span class="text-info">@王也 </span>
<span class="summary-text small">2020-04-10 16:01:27</span>
</a>
</div>
<div class="messageText ml-2 container m-2">没啥子，维手熟尔！</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>
me.css
下面定义的属性有的可能用不到
.navbar a {
color: white !important;
}
.hover:hover {
color: #849199;
}
.summary-text {
font-weight: 300 !important;
letter-spacing: 1px !important;
line-height: 1.8 !important;
font-weight: 300 !important;
}
.summary-text:hover {
cursor: pointer;
}
.me-h4 {
font-size: 1.28em;
font-family: Lato, 'Helvetica Neue', Arial, Helvetica, sans-serif;
font-weight: 700;
line-height: 1.2857em;
text-transform: none;
margin-bottom: 10px;
}
body {
background-image: url(../img/bg.png);
}
.me-a {
text-decoration: none;
}
.mini.fa {
line-height: 1;
font-size: .2em;
}
#noteEdit textarea {
border: #ccc solid 1px;
width: 100%;
height: 200px;
resize: none;
}
.divier {
border-top: 1px solid rgba(34, 36, 38, .15);
border-bottom: 1px solid rgba(255, 255, 255, .1);
margin-top: 2rem;
margin-bottom: 2rem;
border-top-color: rgba(34, 36, 38, .15) !important;
border-left-color: rgba(34, 36, 38, .15) !important;
border-bottom-color: rgba(255, 255, 255, .15) !important;
border-right-color: rgba(255, 255, 255, .15) !important;
color: white;
}
.footer-div {
border-right: 1px solid #666666 !important;
}
.footer-div .me-h4 {
font-weight: 200;
}
.footer-div .me-a {
color: #666666;
align-content: center;
text-align: center;
}
.footer-div .me-a:hover {
color: white;
}
/*复选框开关样式*/
.switch {
position: relative;
display: inline-block;
width: 60px;
height: 34px;
}
.switch input {
display: none;
}
.slider {
position: absolute;
cursor: pointer;
top: 0;
left: 0;
right: 0;
bottom: 0;
background-color: #ccc;
-webkit-transition: .4s;
transition: .4s;
}
.slider:before {
position: absolute;
content: "";
height: 26px;
width: 26px;
left: 4px;
bottom: 4px;
background-color: white;
-webkit-transition: .4s;
transition: .4s;
}
input:checked + .slider {
background-color: #2196F3;
}
input:focus + .slider {
box-shadow: 0 0 1px #2196F3;
}
input:checked + .slider:before {
-webkit-transform: translateX(26px);
-ms-transform: translateX(26px);
transform: translateX(26px);
}
.slider.round {
border-radius: 34px;
}
.slider.round:before {
border-radius: 50%;
}
/****************/
.comment .avatar {
display: block;
width: 35px;
height: 35px;
float: left;
margin: .2em 0 0;
}